As far as I know, the blu-ray discs will not be compatible with existing red-laser DVD players. The good news is that the new players will probably be backwards-compatible with current red-laser discs, although that's not entirely uncertain yet. But assuming they are backwards-compatible, that means you could at least continue to produce standard-definition MPEG2 DVDs which would play in both new and old players -- using the old discs. Beyond that, you'll have to ask your customers to tell you want kind of disc they want, or prepare some of each if you're doing bulk sales somewhere.